Table 1:

Comorbidities of patients in this series^*

Category	Specific Comorbidity
Traumatic	Motor vehicle crash (3), Pedestrian-versus-automobile accident with skull base fractures, prior gunshot wound (2), prior skateboard accident, fall, head trauma not otherwise specified
Ischemic	Prior insular infarct, prior external-carotid-to-internal carotid artery bypass grafting (2)
Vasculopathic	Fibromuscular dysplasia
Dermatologic	PHACE, facial and retinal hemangiomas, vascular birthmark
Hormonal	Growth hormone deficiency with neuromigrational disorder and Moyamoya syndrome, Seckel syndrome (growth hormone deficiency), Majewski type II dwarfism
Hematologic	Von Willebrand disease
Immunologic	AIDS, congenital immunodeficiency, combined immunodeficiency syndrome with cerebral angiodysplasia
Cardiovascular	Congenital aortic stenosis with endocarditis, tricuspid atresia with Fontan procedure, patent ductus arteriosus
Neoplastic	Juvenile pilocytic astrocytoma
Neurologic	Seizure disorder
Other syndromic	Tuberous sclerosis (2), autosomal dominant polycystic kidney disease, trisomy 21 with endocarditis, hemiatrophy, mitochondrial disorder with optic atrophy, family history of Marfan syndrome

^*Numbers in parentheses indicate comorbidities present in multiple patients. Note that infection is not listed as a comorbidity; however, patients with immunodeficiency syndromes and patients with endocarditis due to an identified underlying risk factor (eg, congenital aortic stenosis) are listed under their primary comorbid condition.